EP2830770B1 - Brake mechanism for an electronic pipette - Google Patents

Brake mechanism for an electronic pipette Download PDF

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Publication number
EP2830770B1
EP2830770B1 EP13768512.9A EP13768512A EP2830770B1 EP 2830770 B1 EP2830770 B1 EP 2830770B1 EP 13768512 A EP13768512 A EP 13768512A EP 2830770 B1 EP2830770 B1 EP 2830770B1
Authority
EP
European Patent Office
Prior art keywords
brake
movement
lever
brake member
rotor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP13768512.9A
Other languages
German (de)
French (fr)
Other versions
EP2830770A1 (en
EP2830770A4 (en
Inventor
Ville Hintikka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sartorius Biohit Liquid Handling Oy
Original Assignee
Sartorius Biohit Liquid Handling Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sartorius Biohit Liquid Handling Oy filed Critical Sartorius Biohit Liquid Handling Oy
Publication of EP2830770A1 publication Critical patent/EP2830770A1/en
Publication of EP2830770A4 publication Critical patent/EP2830770A4/en
Application granted granted Critical
Publication of EP2830770B1 publication Critical patent/EP2830770B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
    • B01L3/02—Burettes; Pipettes
    • B01L3/021—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
    • B01L3/02—Burettes; Pipettes
    • B01L3/021—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids
    • B01L3/0217—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids of the plunger pump type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
    • B01L3/02—Burettes; Pipettes
    • B01L3/021—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids
    • B01L3/0217—Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids of the plunger pump type
    • B01L3/0227—Details of motor drive means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D63/00—Brakes not otherwise provided for; Brakes combining more than one of the types of groups F16D49/00 - F16D61/00
    • F16D63/006—Positive locking brakes
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L2200/00—Solutions for specific problems relating to chemical or physical laboratory apparatus
    • B01L2200/06—Fluid handling related problems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L2400/00—Moving or stopping fluids
    • B01L2400/04—Moving fluids with specific forces or mechanical means
    • B01L2400/0475—Moving fluids with specific forces or mechanical means specific mechanical means and fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
    • B01L3/02—Burettes; Pipettes

Definitions

  • a pipette according to the present invention solves the above mentioned problems.
  • the brake actuator in a pipette according to the invention is used for abrupt stopping of the movement of the actuator that moves the plunger.
  • the brake actuator in a pipette according to the invention comprises an electromotive functional member that turns a brake part stopping the rotational movement by means of a mediating mechanism.
  • the invention is directed to an electronic pipette comprising a brake mechanism, which mechanism is used for abrupt stopping of the movement of the actuator that moves the plunger.
  • the mechanism comprises a rotatable, essentially circular rotor which is provided at its periphery with brake notches arranged at regular intervals, and a brake actuator comprising an actuating member, a brake member to which a brake cam compatible with the brake notches is connected, a mediation mechanism for transmission of the movement of the motion member to the brake member, the brake member comprising a turnable member connected to the motion member that is arranged to act with the brake member such that the movement of the turnable member can be accelerated before it essentially effects the movement of the brake member.
  • the brake member comprises an opening in which the turnable member is adapted, here a lever (2) that is turnably adapted on a shaft (2a).
  • the shape of the opening is arranged to be such that the turnable member can turn between two locked end positions.
  • the turnable member turns about 180° from one end position to the other.
  • the size of the opening in relation to the turning lever is such that it enables the turning lever to move between the two positions and that depending of the position of the turning lever in the opening, the turning lever forces the brake member to turn around its axis from a locked position to a free position, and from a free position to a locked position.
  • the brake notches of the rotor comprise protrusions for stopping the rotor and slots for locking the rotor in relation to the brake cam.
  • the protrusions in the rotor stop the rotor as the brake cam locks into a slot between two protrusions.
  • the brake cam ends up in the upper or lower brake notch of figure 3 .
  • the drive means can be a DC-motor, a linear solenoid or a rotary solenoid.
  • the brake drive means is coupled to the brake member by a mediation mechanism.
  • the configuration according to the invention comprising a mediation mechanism has the first advantage of the brake part locking into both end positions.
  • a second advantage of the solution according to the invention is the high momentary velocity of the brake part physically stopping the movement, i.e. the turnable member.
  • the mediation member between the brake drive means, i.e. the movement-inducing means (the motor), and the brake member enables the brake motor to accelerate before the movement for stopping the brake member rotor begins.
  • the turning movement of the turnable member reaches its top speed almost immediately as the movement begins, whereby the brake member hits its target location in the rotating rotor in a more controlled manner.
  • the high velocity of the brake member enables, in terms of functionality, a preferred higher velocity of the stopping part at the braking moment.
  • a third advantage is that due to the kinetic energy accumulated during the acceleration of the drive means, force is gained in the movement of the brake member in the very beginning of the movement, which leads to more reliable opening and closing of the brake.
  • the mediation mechanism functionality according to the invention can be implemented with a crank mechanism or a cam gear mechanism.
  • the brake actuator turns approximately 180 degrees in all, and the brake member stopping the movement turns a fraction of this.
  • the brake member and the brake actuator are coupled to each other with a connecting rod.
  • the brake part reaches its top angular velocity between the two ends of the movement of the brake actuator, the velocity is zero or close to zero at the end positions.
  • the actual brake member stopping the rotation movement is moved by a cam gear mechanism that is simpler than a crank mechanism.
  • An advantage of the invention over the prior art is also that in the structure according to the invention, the brake locks the rotor into place without any clearance causing a movement error.
  • a significant advantage of the structure according to the invention is the ability of the brake to lock into the extreme positions, preventing undesired closing of the brake during running in case of a loss of electricity. This is a very important feature since braking while running at high speed may break the operating mechanism.
  • the brake motor turns the brake member back and forth by means of the mediation mechanism.
  • the brake member turns about 20°.
  • the "barb" of the brake member locks the rotating movement of the rotor and at the other end the rotation is free.
  • Figure 1 shows the brake member (1) that is attached to the body of the brake at its pivot pin (1b) such that it can turn.
  • the task of the brake cam (1a) of the brake member is to stop the rotation of rotor (3) by setting into a brake notch (3a) of the rotor.
  • the turning lever (2) is locked onto the shaft (2a) of the electric motor (not shown) and is so located that at the extreme ends of its movement the brake member is either open or closed.
  • the brake is closed and the relative location and the geometry of the brake member and the turning lever locks the brake at the position even though the motor is not powered on.
  • FIG. 5 the power generation and speed advantage achieved by the mechanism are illustrated.
  • the X-axis represents time and the Y-axis the angular velocity.
  • the motor When the motor is turned on at time t1, it accelerates according to graph A.
  • Graph B illustrates the angular velocity of the brake part.
  • the turning lever hits the brake member at high speed, quickly turning it to its other end position.
  • the movement of the parts stops and the brake is locked at the other end position.
  • FIG. 5 the power generation and speed advantage achieved by the mechanism are illustrated.
  • the X-axis represents time and the Y-axis the angular velocity.
  • the motor When the motor is turned on at time t1, it accelerates according to graph A.
  • Graph B illustrates the angular velocity of the brake member.
  • the turning lever hits the brake member at high speed, quickly turning it to its other end position.
  • the movement of the parts stops and the brake is locked at the other end position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Clinical Laboratory Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Devices For Use In Laboratory Experiments (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Transmission Devices (AREA)
  • Braking Arrangements (AREA)

Description

    Background
  • Solutions based on brakeless stepper motors have conventionally been used as an essential part of the operating machinery of electronic pipettes. The combination presented in Finnish patent no. 87740 including an electronic brake, a DC-motor and a closed loop actuator structure with an encoder has proven to be a good one. With such a construction, a better overall outcome for the operation, size and weight of the pipette is accomplished, compared to solutions involving a stepper motor. Good properties achieved with this structure are, among others, the ability to stop the motion rapidly, and an advantageous size-weight/speed-power ratio. The brake device mentioned in FI 87740 is implemented with a spring return solenoid structure. The problem with this brake structure is that the power consumption is high, which is a disadvantageous feature in a battery powered pipette. To keep the brake open, a current must be fed to the solenoid and for speeding up the brake and for speeding up its movement, the power of its spring has to be increased, which increases the operational power consumption.
    In Japanese patent application H01 210039 A is disclosed a pipette having a mechanism for stepwise dosing. At each press of a button, a lever connected to said button lifts a claw which disengages a ratchet wheel which in turn advances one step. The movement is transferred to a plunger and a predetermined amount of liquid is expelled.
  • A pipette according to the present invention solves the above mentioned problems. The brake actuator in a pipette according to the invention is used for abrupt stopping of the movement of the actuator that moves the plunger. The brake actuator in a pipette according to the invention comprises an electromotive functional member that turns a brake part stopping the rotational movement by means of a mediating mechanism.
  • The invention is directed to an electronic pipette comprising a brake mechanism, which mechanism is used for abrupt stopping of the movement of the actuator that moves the plunger. The mechanism comprises a rotatable, essentially circular rotor which is provided at its periphery with brake notches arranged at regular intervals, and a brake actuator comprising an actuating member, a brake member to which a brake cam compatible with the brake notches is connected, a mediation mechanism for transmission of the movement of the motion member to the brake member, the brake member comprising a turnable member connected to the motion member that is arranged to act with the brake member such that the movement of the turnable member can be accelerated before it essentially effects the movement of the brake member.
  • According to the invention, the brake member comprises an opening in which the turnable member is adapted, here a lever (2) that is turnably adapted on a shaft (2a). The shape of the opening is arranged to be such that the turnable member can turn between two locked end positions. Preferably, the turnable member turns about 180° from one end position to the other. The size of the opening in relation to the turning lever is such that it enables the turning lever to move between the two positions and that depending of the position of the turning lever in the opening, the turning lever forces the brake member to turn around its axis from a locked position to a free position, and from a free position to a locked position.
  • According to a preferred embodiment the brake notches of the rotor comprise protrusions for stopping the rotor and slots for locking the rotor in relation to the brake cam. The protrusions in the rotor stop the rotor as the brake cam locks into a slot between two protrusions. Depending on the direction of rotation, the brake cam ends up in the upper or lower brake notch of figure 3. When the rotor rotates counter-clockwise, the brake cam locks into the lower notch and when it rotates clockwise in turn into the upper notch.
  • In the brake configuration according to the invention, the drive means can be a DC-motor, a linear solenoid or a rotary solenoid.
  • In the configuration according to the invention the brake drive means is coupled to the brake member by a mediation mechanism. The configuration according to the invention comprising a mediation mechanism has the first advantage of the brake part locking into both end positions. A second advantage of the solution according to the invention is the high momentary velocity of the brake part physically stopping the movement, i.e. the turnable member. The mediation member between the brake drive means, i.e. the movement-inducing means (the motor), and the brake member enables the brake motor to accelerate before the movement for stopping the brake member rotor begins. Thus, the turning movement of the turnable member reaches its top speed almost immediately as the movement begins, whereby the brake member hits its target location in the rotating rotor in a more controlled manner. On the other hand, the high velocity of the brake member enables, in terms of functionality, a preferred higher velocity of the stopping part at the braking moment. A third advantage is that due to the kinetic energy accumulated during the acceleration of the drive means, force is gained in the movement of the brake member in the very beginning of the movement, which leads to more reliable opening and closing of the brake.
  • The mediation mechanism functionality according to the invention can be implemented with a crank mechanism or a cam gear mechanism. In both mechanisms the brake actuator turns approximately 180 degrees in all, and the brake member stopping the movement turns a fraction of this. In a cam gear mechanism, the brake member and the brake actuator are coupled to each other with a connecting rod. In this mechanism the brake part reaches its top angular velocity between the two ends of the movement of the brake actuator, the velocity is zero or close to zero at the end positions. According to a preferred embodiment, the actual brake member stopping the rotation movement is moved by a cam gear mechanism that is simpler than a crank mechanism.
  • An advantage of the invention over the prior art is also that in the structure according to the invention, the brake locks the rotor into place without any clearance causing a movement error.
  • A significant advantage of the structure according to the invention is the ability of the brake to lock into the extreme positions, preventing undesired closing of the brake during running in case of a loss of electricity. This is a very important feature since braking while running at high speed may break the operating mechanism.
  • According to the invention the brake motor turns the brake member back and forth by means of the mediation mechanism. In a preferred embodiment the brake member turns about 20°. At one end the "barb" of the brake member locks the rotating movement of the rotor and at the other end the rotation is free.
  • In Figures 1-4, one technical solution for implementing the function according to the invention is presented. Figure 1 shows the brake member (1) that is attached to the body of the brake at its pivot pin (1b) such that it can turn. The task of the brake cam (1a) of the brake member is to stop the rotation of rotor (3) by setting into a brake notch (3a) of the rotor. The turning lever (2) is locked onto the shaft (2a) of the electric motor (not shown) and is so located that at the extreme ends of its movement the brake member is either open or closed. In the situation in figure 1, the brake is closed and the relative location and the geometry of the brake member and the turning lever locks the brake at the position even though the motor is not powered on.
  • In Figure 2, the motor is switched on and the turning lever has accelerated freely approximately 90° and is about to hit the brake member.
  • In the situation of Figure 3, the turning lever has turned to its other end position and has at the same time turned the brake member into its open position. Also in this position, the brake is locked into position as in figure 1.
  • In Figure 4 we are in the situation of figure 2 of applying the brake.
  • In Figure 5, the power generation and speed advantage achieved by the mechanism are illustrated. The X-axis represents time and the Y-axis the angular velocity. When the motor is turned on at time t1, it accelerates according to graph A. Graph B illustrates the angular velocity of the brake part. At time t2 the turning lever hits the brake member at high speed, quickly turning it to its other end position. At time t3 the movement of the parts stops and the brake is locked at the other end position.
  • In Figure 4 we are in the situation where the turning lever is about to hit the brake member, as in figure 2, now for closing the brake.
  • In Figure 5, the power generation and speed advantage achieved by the mechanism are illustrated. The X-axis represents time and the Y-axis the angular velocity. When the motor is turned on at time t1, it accelerates according to graph A. Graph B illustrates the angular velocity of the brake member. At time t2 the turning lever hits the brake member at high speed, quickly turning it to its other end position. At time t3 the movement of the parts stops and the brake is locked at the other end position.

Claims (3)

  1. An electronic pipette comprising a brake mechanism, wherein the mechanism comprises a rotatable, circular rotor (3) that is at its periphery provided with brake notches (3a) arranged at regular intervals, and a brake actuator comprising
    - a movement-inducing means,
    - a brake member (1) comprising a brake cam (1a) that is compatible with and settable into the brake notches (3a),
    - a mediation mechanism for transmission of the movement of the movement-inducing means to the brake member (1),
    characterized in that the brake member comprises an opening in which a turnable lever (2) is adapted;
    the opening in the brake member (1) being such that the lever (2) can turn between two end positions into which the lever (2) is lockable;
    wherein the lever (2) is arranged, upon movement within the opening between said two end positions, to force the brake member (1) to turn around a pivot (1b) from a position where the brake cam (1a) locks the rotor (3) to a position where the rotor (3) is free and vice versa.
  2. The pipette according to claim 1, characterized in that the movement-inducing means is an electric motor.
  3. The pipette according to claim 1 or claim 2, characterized in that
    the brake member (1) is turnable by about 20° around the pivot (1b), and
    the lever (2) is turnable by about 180° in the opening between said two end positions,
    wherein the lever (2) is arranged to hit and turn the brake member (1) at a turning angle of the lever of about 90°.
EP13768512.9A 2012-03-30 2013-04-02 Brake mechanism for an electronic pipette Active EP2830770B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20125372A FI125310B (en) 2012-03-30 2012-03-30 Brake mechanism for electronic pipette
PCT/FI2013/050359 WO2013144457A1 (en) 2012-03-30 2013-04-02 Brake mechanism for an electronic pipette

Publications (3)

Publication Number Publication Date
EP2830770A1 EP2830770A1 (en) 2015-02-04
EP2830770A4 EP2830770A4 (en) 2015-11-25
EP2830770B1 true EP2830770B1 (en) 2018-10-10

Family

ID=49258316

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13768512.9A Active EP2830770B1 (en) 2012-03-30 2013-04-02 Brake mechanism for an electronic pipette

Country Status (7)

Country Link
US (1) US9387473B2 (en)
EP (1) EP2830770B1 (en)
JP (1) JP6268160B2 (en)
CN (1) CN104169005B (en)
FI (1) FI125310B (en)
RU (1) RU2638367C2 (en)
WO (1) WO2013144457A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10094161B2 (en) * 2015-05-15 2018-10-09 Vapensystems Inc. Weapons storage system and locking mechanism
US10876585B2 (en) * 2017-08-21 2020-12-29 Hall Labs Llc Parking brake and anti-theft apparatus for vented disc brakes

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01210039A (en) * 1988-02-19 1989-08-23 Fuji Photo Film Co Ltd Pipette for partial pipetting

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SU13622A1 (en) * 1928-12-21 1930-03-31 А.И. Певзнер A device for turning the flywheel of internal combustion engines at the start of the course
US2175601A (en) * 1936-12-19 1939-10-10 Grund William Calking gun
US5187990A (en) 1984-02-16 1993-02-23 Rainin Instrument Co., Inc. Method for dispensing liquids with a pipette with compensation for air pressure and surface tension
FI87740C (en) * 1990-05-04 1994-04-08 Biohit Oy Pipette
FI961649A0 (en) * 1996-04-15 1996-04-15 Labsystems Oy Spaerrpipett
WO2000051738A1 (en) * 1999-03-05 2000-09-08 Rainin Instrument Co., Inc. Improved battery powered microprocessor controlled hand portable electronic pipette
US6254832B1 (en) * 1999-03-05 2001-07-03 Rainin Instrument Co., Inc. Battery powered microprocessor controlled hand portable electronic pipette
US6532837B1 (en) * 2000-02-03 2003-03-18 Rainin Instrument, Llc Pipette device with tip ejector utilizing stored energy
US6428750B1 (en) * 2000-02-17 2002-08-06 Rainin Instrument, Llc Volume adjustable manual pipette with quick set volume adjustment
US6715369B2 (en) * 2000-08-03 2004-04-06 Nichiryo Co., Ltd. Hybrid pipette
JP3640904B2 (en) * 2000-08-03 2005-04-20 株式会社ニチリョー Hybrid pipette device
RU2340397C2 (en) * 2003-11-27 2008-12-10 Джилсон С.А.С. Electronic pipette with display and manipulator for controlling liquid suction and distribution
US7690293B2 (en) 2007-01-05 2010-04-06 Ivek Corporation Coupling system for use with fluid displacement apparatus
DE102007006076B4 (en) * 2007-02-02 2008-10-30 Brand Gmbh + Co Kg Multichannel pipetting
PL211690B1 (en) * 2007-11-23 2012-06-29 Pz Htl Społka Akcyjna Pipette with preset volume of collected liquid
CN102917795B (en) * 2010-05-03 2014-11-12 因特格拉生物科学股份公司 Manually directed, multi-channel electronic pipetting system

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
JPH01210039A (en) * 1988-02-19 1989-08-23 Fuji Photo Film Co Ltd Pipette for partial pipetting

Also Published As

Publication number Publication date
JP6268160B2 (en) 2018-01-24
EP2830770A1 (en) 2015-02-04
CN104169005A (en) 2014-11-26
JP2015518417A (en) 2015-07-02
WO2013144457A1 (en) 2013-10-03
CN104169005B (en) 2016-06-29
FI125310B (en) 2015-08-31
US20150050197A1 (en) 2015-02-19
US9387473B2 (en) 2016-07-12
RU2638367C2 (en) 2017-12-13
RU2014143485A (en) 2016-05-27
EP2830770A4 (en) 2015-11-25
FI20125372L (en) 2013-10-01

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